Serra EG., Schwerd T., Moutsianas L., Cavounidis A., Fachal L., Pandey S., Kammermeier J., Croft NM., Posovszky C., Rodrigues A., Russell RK., Barakat F., Auth MKH., Heuschkel R., Zilbauer M., Fyderek K., Braegger C., Travis SP., Satsangi J., Parkes M., Thapar N., Ferry H., Matte JC., Gilmour KC., Wedrychowicz A., Sullivan P., Moore C., Sambrook J., Ouwehand W., Roberts D., Danesh J., Baeumler TA., Fulga TA., Carrami EM., Ahmed A., Wilson R., Barrett JC., Elkadri A., Griffiths AM., COLORS in IBD group investigators None., Oxford IBD cohort study investigators None., INTERVAL Study None., Swiss IBD cohort investigators None., UK IBD Genetics Consortium None., NIDDK IBD Genetics Consortium None., Snapper SB., Shah N., Muise AM., Wilson DC., Uhlig HH., Anderson CA.